1. Understand the measured mediuma) Liquid; object; dust; whether it is regular; liquid and flat objects can use the actual range, and the others can be increased by 1-2 specifications; b) whether anti-corrosion is required; some chemicals require anti-corrosion probes (materials are poly Tetrafluoroethylene (Ptfe)); c) Whether there is a volatile gas (generally a chemical substance); in some cases, the gas volatilizes to the probe, which will affect the sound velocity of the ultrasonic wave, causing errors in the measurement. This needs to know what kind of gas; d) Whether there is fog: The treatment method, add 4F membrane to the bottom of the probe to prevent the probe from condensation, the blind area of the 4F membrane will be larger, generally 40CM.2. Understand the jara) Liquid level change range; the highest liquid level and zero position, which is the corresponding 4-20MA, can be set freely here; b) the height of the tank itself; c) the distance between the diameter and the installation position of the meter and the tank wall; There is a problem with the beam angle, which is generally 8-10 degrees; d) whether it is closed; e) with or without pressure; it can withstand 0.3MPA. F) Temperature: It depends on the temperature that actually affects the meter, -25-80 degrees. 3. Understand on-site installation requirements a) Blind zone: 20-60CM depends on the measuring range, and the blind zone should be reserved for installation. It is recommended to set as 40CM; b) Integrated or split; c) several wire system; d) cable length (split) standard Equipped with 10M; e) Installation method: flange specifications, etc.; f) Power supply voltage selection.Advantages of ultrasonic level gaugeNon-contact measurement;No moving parts, simple structure, long service life;Corrosion resistance (most of the probes are made of PVDF, PP and other materials);Automatic temperature compensation function;Not affected by the humidity and viscosity of the medium;Not affected by the dielectric constant, electrical conductivity, and thermal conductivity of the medium;Excellent cost performance.Precautions for ultrasonic level gaugeThe temperature resistance is limited, most of which are less than 60℃, and some special products can reach 100℃;It cannot be measured in a vacuum environment, and large fluctuations in pressure affect the measurement accuracy;
Try to avoid interference factors such as bubbles, obstacles, waves, etc. during installation.
Post time: 21-09-21